All planets have gravity. All objects have
gravity, but we can't feel it unless that objects
are really big. Planets are huge, so we can feel
their gravity pulling us. We feel heavier on earth
than on the moon because the earth is bigger
(therefore it's gravity pull is bigger).
The shape of the earth is a different subject
-- that has more to do with what shape was created
when the planet was formed (a round shape is very
stable so when all the pieces are coming together,
it's easier to take a round shape (based on
physics of attraction)).
I hope this is helpful, but let me know if I
can clarify something further!
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